This document teaches you how to use UCP Monitoring effectively.
Setting performance counters by means of the CLI happens to be a little-known treasure.
Without "setting" any thresholds with these performance counters, UCP can only tell you about hardware health. But, if you configure some perf counters, the elements' health status as displayed in UCP can be affected by I/O and performance too.
I wrote this for a UCP 3.5 course, but I've just updated it for UCP 4.1.1.